Box lidding machine



5 Sheets-Sheet 1 Filed June 2, 1947 w l l J "NH.

INVENTOR $6.12 Benson Mi M429 ATTORNEYS H. D. BENSON Box LIDDING MACHINEJan. 2, 1951 5 Sheets-Sheet 2 Filed June 2, 1947 INVENTOR.

Jan. 2, 1951 H. D. BENSON 2,536,416

BOX LIDDING MACHINE Filed June 2, 1947 s Sheets-Sheet 4 v Q N Q k. a 3

JflDBenson Mrwul/ HTTKS' Jan. 2, 1951 H. D. BENSON BOX LIDDING MACHINE 5Sheets-Sheet 5 Filed June 2, 1947 INVENTOR .715. .D, B e 22.50::

ATTORNEYS Patented Jan. 2, 1951 2 ,536,415 BOX LIDDING MACHINE- Harry DBenson, Fresno, Califl, assignor to Gem eral Nailing MachineCorporation, Sanger,

CalifQa corporation of California Application June, 2, 1947, Serial No.751,741

13. Claims.

, This invention is directed to, and it is an object to provide, animproved, automatic nailing machine. for boxes, particularly of the typeused for. transporting fruit and vegetables.

' While the machine is generally adaptable forv other box nailingoperations, it is here shown as adapted for nailing lids on boxes; thepro vision of a novel lidding table assembly being another object of theinvention.

An additional object of the present, invention is to provide a nailingmachine, as in the preceding paragraph, in which the lidding table,assembly includes an endless chain feed for boxes, the latter resting onthe upper runs of the trans versely spaced chains of said feed, andsaid, runs being yieldably supported to permit of limited downwardmovement of each box into engagement, at the bottom adjacent the ends,with rigid stop bars for the lid nailing operation.

A novel lid holder and aliner is associated with the lid nailing units,and functions to aline the lid box in advance of said lid nailingoperation. A further object of the invention is to incorporate, in thenailing machine, a novel, adjust: able mounting frame for the boxsupporting units, and box nailing units; such fram including a pair. oftransversely spaced, vertical posts to, which the units are attached,and the posts being mounted fo guided lateral adjustment, without in anyway disturbing the setting of said at-, tached units, to adjust themachine for different length boxes. Thus, as th box engaging workingparts move in unitary relation with the posts, the machine can beadjusted readily and easily.

It is also an object of this invention to provide an adjustable mountingframe, as the preceding paragraph, which includes therein a vertie callyreciprocable, horizontal, top driving bar; the posts being verticallyslotted for the guiding reception of said driving top driving her; andthe box nailing units being laterally adjustably attached to, andactuated by said top driving bars and slidable on said slotted posts.Another object of this invention is to provide a box nailing machine,wherein said adjustable mounting frame is designed so that box engagingworking parts, such as the lidding table assembly, may be removedconveniently, and other types ofworking parts, such as a box framingassembly, substituted. Thus, the machine is convertible for. numerousdifferent box nailing operations.

A, further object of the invention is to produce a practiqaldevice andone which will be. exceed: ingly effective for the purpose for whieh itis des ned.

These; objects arev accomplished by means, of such structure andrelative arrangement of parts as willfully appear by a perusal of thefollowing specification and claims.

In thedrawings:

Figure 1 is a front elevation of the machine.

Figure 2 is a fragmentary, perspective view partly in section and takengenerally along a lin 2' 2fof Fig. 1, showing the upper end position ofoneo'f thefvertically. slotted posts and its relause to, the adjacentand cooperative parts of the mounting frame at the top.

Figure 3 is a fragmentary perspective view partly in section and takengenerally along a line 3 3 of Fig. 1, without the drive shaft and chain,andfshowing the lower end portion ofone of the vertically slotted postsand its relation to the adjacent and cooperative parts of the mountingframe at the bottom.

Figure 4 is a fragmentary sectional elevation of one of the lid nailingunits traveling downward toward but short of nailing position.

Figure 5 is a similar View but shows said lid nailing unit in nailingposition.

Figure (3 is a view looking in the direction of the arrows on line 6--Gof Fig. 1 and showing a fragmentary, face elevation of one of the lidnailing units, including the lid holder and aliner.

Figure '7 is a fragmentary sectional plan of a portion ofsaid lidnailing unit.

Figure 8 is a view looking in th direction of the arrows on a line 8-8of Fig. 1 and is a fragmentary elevation showing one of the liddingtable units.

Figurev 9 is a cross section on line 9-9 of Fig. 8.

Figure 10 is a cross section taken generally on a line Ill-It of Fig. 8but showing the carrying chain depressed into a position substantiallyflush with the nailing table bar.

Fig. 11 is a fragmentary sectional View taken on a line H!l of Fig. 6.

Fig. 12 is a fragmentary sectional view taken on a line I2,!2 of Fig. 8.

13 is a fragmentary sectional View taken on a line [3-13 of Fig. 6.

Fig. 1% is a fragmentary elevation of one of the legs of the main frame,showing the connection of the transverse bottom bars therewith.

Referring now more particularly to the oharacters of reference on thedrawings, the improved nailing machine comprises a main frame, indicated generally at i, which main frame is of fabricated sheet metalincluding transversely spaced, hollow legs 2 connected at the upper endm in 3 by a top beam 3, and connected at the bottom by a hollow basehousing 4.

The main frame thus defines a substantially rectangular opening 5 inwhich the box engaging working parts of the machine are disposed in themanner hereinafter described in detail.

Mainly within the opening 5 the machine includes an adjustable mountingframe, indicated generally at 6, which mounting frame carries a pair oftransversely spaced lid nailing units I, and therebelow a pair ofcorresponding lidding table units 8. The top beam 3 of the main frame Isupports a power actuated nail stripper 9 which feeds nails throughflexible tubes ID to the lid nailing units l; the nail stripper 9 andits feeding. tubes ill being substantially conventional.

The lid nailing units I are vertically actuated or reciprocated by ahorizontal top driving bar II included, in vertically reciprocablerelation,

in the mounting frame 3, and said top driving r bar II is actuated onecomplete cycle at a time from a normally raised starting position byconnecting rods I2 secured to opposite ends of said bar and dependingwithin the hollow legs 2 of the main frame I. Such connecting rods I2have dashpot-like shock absorbing means included therein and areconnected, at their lower ends, to cranks I3 on a cross shaft I4journaled within the hollow, base housing 4 of the main frame I.

An electric motor I5 is mounted in the base housing 4 and, through themechanism of a clutch and brake unit, indicated generally at i3, isadapted to rotate the cranks I3 through only a full circle upon eachdepression of a control pedal Ill. The operator steps on the pedal ii,and the clutch and brake unit then function to impart one revolutiononly to the cranks I3, which in turn, working through the connectingrods I2, reciprocate the top driving bar I i through one cycle, startingfrom its top position, and actuating the lid nailing units 1.

The above comprises the general assembly of the machine, and there isnow described the details of the adjustable mounting frame 6, to-

gether with the lid nailing units 7 and lidding nected to the frame legs2 as shown in Fig. 14.

At its lower end each post I3 includes a U-shaped, downwardly openingyoke 2i straddling the bottom bars 23 transversely thereof, with thelegs of such yoke bearing on the outer faces of such bars. in a mannerto slidably bear against adjacent faces of the bars 23; one of the guidefeet 22 being elongated and including an inverted L-- shaped guidefinger 23 engaging over the adjacent one of said bars 26. With thisarrangement the posts I8 are adjustable, at the bottom, along theassembly of bars 23, in accurately guided relation. Normally, however,said posts 53 are fixed against sliding motion relative to the bars byreason of the fact that one leg 24 of the U- shaped yoke M is a separateelement secured by a bolt 25; tightening of which bolt releasably clampsthe yoke 2i in a fixed position.

The top driving bar I I is vertically slotted lengthwise thereof, as at26, and said top bar pro- Guide feet 22 are fixed to the yoke 2| jects,in guided relation, through the slots IQ of the posts I8 in verticallyreciprocable relation.

At its end portions, and within the hollow legs 2, the top driving barII projects in guided, and also vertically reciprocable, relation,between pairs of upstanding guide bars 21. outwardly of each pair ofguide bars 21 the top driving bar .II is fixed with an end plate 23,which bears in guided relation against the bars 27, and it is to theseend plates 28 that the connecting rods I2 are attached at their upperends. See Figs. 1 and 2.

Each of the lid nailing units I is of identical construction, andtherefore a description of one will suffice for both. This constructionis shown in Figs. 1, 2 and 4-6.

Each lid nailing unit i comprises an upper cross bar 29 attached to theunder side of the top driving bar II by a bolt 30 which passes throughthe slot 26 in said top bar. I

The upper cross bar 29 is disposed laterally inwardly relative to thecorresponding posts I8, and secured to the outer face thereof arebearing blocks 3I running on the adjacent faces of said post 53. Alsosecured to the outer face of the bar 29 by welding or other means is alocator block 32. This block 32 is shown in Figs. 4 and 5 and projectsthrough the space IS in the post I8 with a close running fit therein andis held in position by a strap 33 which is bolted or otherwise securedto block 32 and which strap bears on the outer face of the post I8. Thelocator block 32 also has a portion 32a which fits closely in the slot26 of the top driving bar II.

A lower cross bar 34 is disposed some distance horizontally below theuppencross bar 29 and slightly closer to the adjacent post I8; saidlower cross bar 34 having a guide block 35 fixed thereto centrally ofits ends, and said guide block 35 runs in the slot IQ of the post I8.The lower cross bar 34 and the guide block 35 are suspended from thelocator block 32 by a suspension rod 36 fixed to the guide block 35,extending slidably through the locator block 32 and having a head 31above said locator block. The rod- 36 thus normally suspends the lowercross bar 34 a predeter-,

mined distance below the upper cross bar 29.

. The guide block 35 is held against escape from the post slot l9 in onedirection by the lower cross bar 34, and in th opposite direction by a,cross strap 38 bearing on the opposite side of the post I8. The crossstrap 38 is formed, at opposite ends, with circular seats 39 on whichvertical shafts 43 are secured; said vertical shafts running throughvertical sleeves 4| on opposite ends of the cross strap 33. Compressionsprings 42 surround the shafts 40, normally urging the cross strap 38,guide block 35, and lower cross bar 34 downwardly to the limit allowedby the suspension rod 36.

A plurality of nailing chucks 43 are fixed on the lower cross bar 34 inpredetermined and adjustably spaced relation; the nail tubes Illleadingto corresponding ones of said chucks 43. Nailing or hammer rods 44upstand from each chuck 43 cross bar 29.

7 With each reciprocation or cycle of the top driving bar II, the lidnailing units I initially travel downwardly with their parts in therelative positions of Fig. 4 until the chucks 43 bear on the box,

as will hereinafter more fully appear. Thereafter,

Stops t! in the slots iii of posts it serve to it limit downward travelor guide blocks 35 and chucks 43 when the machine is operated without abox therein.

Each of the lid nailing units "d includes a depending lid holding andbox alining plate 48 disposed below the lower cross bar 3 parallelthereto, and mainly below and somewhat laterally out relative to thenailing chucks 43.

At its upper edge the plate &9 is fixed to a horizontal shaft :29journaled in brackets lta secured to and depending from the cross bar 3at its ends (see Figs. 1, 6 and ll) so that said plate is swingabletransversely. A torque spring 59 is connected to the shaft 49 in adirection tending to rotate the shaft so' as to swing the plate 8 awayfrom the corresponding post It. Spaced, rigidly mounted fingers5iproject inwardly at a downward slope between certain of the nailingchucks 4-3, and at their outer ends said fingers 5i carry a horizontalactuating rod 52 for the box aligning and lid supporting plate it, whichrod extends lengthwise of the direction of movement of boxes through themachine. lfhe actuating rod 52 is upturned at its lead end, and includesa lid stop 53 atits opposite end, said actuating rod 52 normallyextending in a horizontal plane somewhat below the lower ends of saidnailing chucks 43.

Intermediate its upper and lower edges, and centrally of its ends, theplate as is fitted with an inwardly projecting, spring-pressed ball 54.

When the machine is in operation, initially separate box lids are fed,one at a time, into the machine, being disposed between the plates as ofthe lid nailing units l, and releasably supported from below, atopposite ends, by the springpressed balls 5% preparatory to downwardtravel with said units '5 for nailing on top of a box then supported atopposite ends in the machine by the lidding table units 8, each of whichcomprises:

A horizontal nailing table bar 55 extends transversely of thecorresponding post 58 laterally inwardly of the latter, and is fixed toa horizontal side plate 53 which extends in the same direction, i. e.lengthwise of the direction oi": movement of boxes through the machine.The side plate 56 is in turn fixed to a locator block 5? which includesa part extending, in locating relation, in the vertical slot E9 of saidcorresponding post 18. The locator block 51 is fitted with a back cap 58which non-movably but adjustably clamps the looator block 5i to saidcorresponding post I8. In this manner the horizontal nailing table bar55 is rigidly but adjustably attached to the corresponding post 18.

A. downwardly yieldably mounted, chain supporting bar as extendsalongside the horizontal nailing table bar; the upper edge of the bar 59and the upper edge of the bar 55 normally being substantially flush. Thechain supporting bar 59 is yieldably mounted by means of bolts 60engaging through vertically elongated slots 6| in the bar 59; therebeing leaf springs 52 engaging said bar 59' from below and normally butyieldably 6 urging the same upwardly to the limit of its vet ticalmotion as shown in Fig. 9.

The yieldably mounted bar 59' supports the upper run 53 of an endlesschain 64 whichturns about end sprockets 65 on opposite end portions ofthe bar 59; said endless chain 64 being sprocket driven from a crossshaft 56 below the units 8; and which cross shaft is constantly actuatedfrom the motor l5 by means including an endless chain and sprocket unit61.

An adjustable idler tea, as shown in Fig. '8, maintains proper tensionon the chain.

With the above arrangement it will be seen that the upper runs of thechains 63 of the lidding table units 8 normally run above the upper edgeof the horizontal nailing bars 55.

When the machine is in operation, for lidding loaded boxes, the loadedboxes are fed, one at a time and by suitable means, onto the assembly oflidoling table units 3; each box 63, as itreaches the machine, restingat opposite ends on the upper runs 83 of the chains, and being fed intosaid machine thereby. When the box reaches a pre-' determined positionbelow the lid nailing units 1, said box abuts against box stopsE59carriedby the lidding table units 8 adjacent their discharge end andnormally projecting into the path of box travel. Each stop 99 is mountedon'a shaft 69a journaled in bearings tab secured to the back plate 56.See Figs. 8, 9 and 12.

When each box 68 engages the stops 69 the upper runs 53 of the chains fil slip under said box, and during the nailing operation.

As each 00x58 comes to rest against the box stop 69, the pedal ll isdepressed to cause a driving cycle of the top bar I l and the lidnailing units 1.

A lid has previously been engaged between the lid holding plates 48 andis supported by the spring-pressed ball 54, and such lid travels withthe nailing units'l. Lid stops 53, at the rear end of the actuating rods52, locate each lidproperly lengthwise of the direction of box travel inthe machine. As the nailing units I reach the box 68, the nailing chucks53 bear against the lid 10, and the latter bears against the top edgesof the ends of the box 58; the actuating rods 52 then having been urgedupwardly somewhat, swinging the plates 48 toward each other sufficientto aline the ends of the box with the corresponding ends of the lid. Atthis time the box 68 has also been depressed by the chucks l3, causingdownward yielding of the upper chain runs 53 and the bars 59 from theposition of Fig. 9 to the position of Fig. 10 until the box rests firmlyat the bottom on top of the horizontal nailing table bars 55.

With continued downward motion of the top driving bar H, the nailingrods 44 drive through the nailing chucks 33 to penetrate the nailsthrough the lid into the box end.

Rods ll depend from the cross strips 33 ofthe nailing units 19, andslidably engage through sleeves 72 connected to actuating linkage T3 forcorresponding box stops A collar 14 on each rod H engages thecorresponding sleeve Hand depresses it as the top driving bar H reachesthe bottom of its stroke, and at which time the nailing operation iscompleted.

When the collars'l l engage and shift the sleeves 2-2 downward, the boxstops 59 swing upwardly, against the tension of torque springs 15, to aclearance position to permit of passage of the lidded box from themachine. These springs are also compressible, being initially loaded orcompressed when the box strikesthe stops-69'. 75 Thus, when the stopsare swung upwardpthe springs urge said stops rearward a limited distancebut alongside the box. Thus, once the lidded boxes begin to travel, thestops 89 cannot return to stop position, by the torque of springs 15,until said lidded box is out of the machine.

The above described automatic nailing machine provides for the practicaland convenient nailing of box parts; the machine being characterized byits novel adjustable mounting frame; the effective nailing units 1,including the lid holding and box lining plate assembly; and the novellidding table unit assembly incorporating the downwardly yieldable chainsupporting arrangement.

From the foregoing description it will be readily seen that there hasbeen produced such a device as substantially fulfills the objects of theinvention as set forth herein.

While this specification sets forth in detail the present and preferredconstruction of the device, still in practice such deviations from suchdetail may be resorted to as do not form a departure from the spirit ofthe invention as defined by the appended claims.

Having thus described the invention, the following is claimed as new anduseful, and upon which Letters Patent are desired:

1. A box lidding machine comprising an upstanding main frame, anupstanding mounting frame on the main frame, transversely spacedvertically movable nailing units on the mounting frame, and transverselyspaced Work supporting table units on the mounting frame below and incooperative relation to corresponding nailing units; said mounting frameincluding a pair of transversely adjustably spaced posts, andcorresponding nailing and table units being attached to correspondingposts for adjustment therewith in unitary relation.

2. A box lidding machine comprising an upstanding main frame, anupstanding mounting frame on the main frame, transversely spacedvertically movable nailing units on the mounting frame, and transverselyspaced work supporting table units on the mounting frame below and incooperative relation to corresponding nailing units; said mounting frameincluding a horizontal bottom bar, a pair of transversely spaced ingframe, and transversely spaced work'supporting table units on themounting frame below and in cooperative relation to correspondingnailing units; said mounting frame including a horizontal bottom bar, apair of transversely spaced posts upstanding from the bottombar, meanstransversely adjustably securing the posts adjacent their lower ends tothe bottom bar, the nailing and table units being attached tocorresponding posts for adjustment therewith in uni tary relation, and ahorizontal top driving bar mounted for vertical reciprocation, the postsbeing vertically slotted and the driving bar extending therethrough inslidable relation.

5. A box lidding machine comprising an up- 7 standing main frame, anupstanding mounting frame on the main frame, transversely spacedvertically movable nailing units on the mounting frame, and transverselyspacedwork supporting table units on the mounting frame below and incooperative relation to corresponding nailing units; said mounting frameincluding a horizontal bottom bar, a pair of transverselyspaced postsupstanding from the bottom bar, means transversely adjustably securingthe posts adjacent their lower ends to the bottom bar, correspondingvertically spaced nailing and table units being attached tocorresponding posts for adjustment therewith in unitary relation, ahorizontal top driving bar, the posts being vertically slotted and thedriving bar extending" thereposts upstanding from the bottom bar, and

means transversely adjustably securing the posts adjacent their lowerends to the bottom bar, the nailing and table units being attached tocorresponding posts for adjustment therewith in unitary relation.

3. A box lidding machine comprising an upstanding main frame, anupstanding mounting frame on the main frame, transversely spacedvertically movable nailing units on the mounting frame, and transverselyspaced work supporting table units on the mounting frame below and incooperative relation to corresponding nailing units; said mounting frameincluding a horizontal bottom bar, a pair of transversely spaced postsupstanding from the bottom bar, means transversely adjustably securingthe posts adjacenttheir lower ends to the bottom bar, the nailing andtable units being attached to corresponding posts for adjustmenttherewith in unitary relation, and a horizontal top driving bar mountedfor vertical reciprocation and slidable relative to said posts, thenailing units being connected to said driving bar.

4. A box lidding machine comprising an upstanding main frame, anupstanding mounting frame on the main frame, transversely spacedvertically movable nailing units on the mountthrough intermediate itsends in slidable relation, and vertical guide means cooperating withopposite end portions of the driving bar, the nailing units beingconnected to and actuated by said driving bar.

6. A box lidding machine comprising an up the bottom bars and bearingagainst adjacent faces thereof in post guiding relation.

7. A box lidding machine comprising an upstanding main frame, anupstanding mounting frame on the main frame, transversely spacedvertically movable nailing units on the mounting frame, and transverselyspaced work supporting table units on the mounting frame below 7 and incooperative relation to corresponding nailing units; said mounting frameincluding a horizontal bottom bar, a pair of transversely spaced postsupstanding from the bottom bar, means transversely adjustably securingthe posts adjacent their lower ends to the bottom bar, a horizontal topdriving bar, means operative to power reciprocate the top driving barthrough a vertical cycle, the posts being vertically slotted and the topdriving bar extending therethrough intermediate its ends in slidablerelation, the corresponding vertically spaced nailing unit and tableunit being attached to each post below the top driving bar, and meansconnectingthe top driving bar in operative relation to each nailingunit.

v8. A box lidding machine comprising an up standing main frame, anupstanding mounting frame on the main frame, transversely spacedvertically movable nailing units on the mounting frame, and transverselyspaced work sup porting table units on the mounting frame below and incooperative relation to corresponding nailing units; said mounting frameincluding a horizontal bottom bar, a pair of transversely spaced postsupstanding from the bottom bar,

means transversely adjustably securing the posts adjacent their lowerends to the bottom bar, a horizontal top driving bar, means operative topower reciprocate the top driving bar through a vertical cycle, theposts being vertically slotted and the top driving bar extendingtherethrough intermediate its ends in slidable relation, thecorresponding vertically spaced nailing unit and table unit beingattached to each post below the top driving bar, each nailing unitincluding a cross bar releasably secured to the top driving bar foradjustment longitudinally thereof.

9. A box lidding machine comprising an upstanding main frame, anupstanding mounting frame on the main frame, transversely spacedvertically movable nailing units on the mounting frame, and transverselyspaced work supporting table units on the mounting frame below and incooperative relation. to corresponding nailing units; said mountingframe including a horizontal bottom bar, a pair of transversely spacedposts upstanding from the bottom bar, means transversely adjustablysecuring the posts adjacent their lower ends to the bottom bar, ahorizontal top driving bar, means operative to power reciprocate the topdriving bar through a vertical f,

cycle, the posts being vertically slotted and the top driving barextending therethrough intermediate its ends in slidable relation, thecorresponding vertically spaced nailing unit and table unit beingattached to each post below the top driving bar, in each nailing unitincluding a cross bar releasably secured to the top driving bar foradjustment longitudinally thereof, the top driving bar being verticallyslotted, and a locator block on the cross bar engaging in the slot ofsaid top driving bar.

10. A box lidding machine comprising an upstanding main frame, anupstanding mounting frame on the main frame, transversely spacedvertically movable nailing units on the mounting frame, and transverselyspaced work supporting table units on the mounting frame below and incooperative relation to corresponding nailing units; said mounting frameincluding a horizontal bottom bar, a pair of transversely spaced postsupstanding from the bottom bar, means transversely adjustably securingthe posts adjacent their lower ends to the bottom bar, a horizontal topdriving bar, means operative to power reciprocate the top driving barthrough a vertical cycle, the posts being vertically slotted and the topdriving bar extending therethrough intermediate its ends in slidablerelation, the corresponding vertically spaced nailing unit and tableunit being attached to each post below the top driving bar, in eachnailing unit including a cross bar releasably secured to the top drivingbar for adjustment longitudinally thereof, the top driving bar beingvertically slotted, a locator block fixed on the cross bar andprojecting into the slot of the adjacent post from one side thereof, across strap affixed to the locator block: on the opposite side of saidpost, and a portion of i0 said block engaging in the slot of the topdriving bar in locating relation.

11. A box lidding machine comprising an upstanding main frame, anupstanding mounting frame on the main frame, transversely spacedvertically movable nailing units on the mounting frame, and transverselyspaced work supporting table units on the mounting frame below and incooperative relation to corresponding nailing units; each nailing unitbeing vertically reciprocated, and including a horizontal row of nailingchucks, laterally swingable lid holding and box alining plates disposedhorizontally below and laterally out relative to said row of chucks, andmeans operative to swing the corresponding lid holding and box aliningplates laterally inward as the nailing units lower in nailing relationto a box on said'table units, said plates having a spring pressed lidholding element projecting laterally inwardly from the face thereof andadapted to receive and support a lid before the nailing units so lower.

12. A box lidding machine comprising an upstanding main frame includinghollow sheet metal side legs in transversely spaced relation, anupstanding mounting frame within the main frame, said mounting frameincluding a horizontal bottom bar extending between said legs, ahorizontal top driving bar extending between and projecting into saidlegs, said top driving bar being vertically reciprocable, a transverselyspaced pair of posts mounted on the bottom bar and upstanding betweensaid legs, said posts being arranged in guiding relation to the topdriving bar, transversely spaced nailing units on the posts invertically reciprocable relation and operatively connected to the topdriving bar, work supporting table units on the posts below andcorresponding to said nailing units, means within the legs guidingreciprocation of the top driving bar, and other means in the legsconnected to opposite ends of the top driving bar and operative toreciprocate said top driving bar.

13. A box lidding machine comprising a support, a pair of verticallydisposed posts mounted on the support in transversely spacedsubstantially parallel relation, the posts being adjust abletransversely of each other along the support whereby to vary the spacebetween the posts, a nailing unit mounted on each post for verticalsliding movement relative thereto, awork supporting table unit mountedon each post in vertically spaced relation to the nailing unit on suchpost, the nailing unit and the table unit on each post being bothmovable with the post to any adjusted position thereof relative to theother post, a driving bar mounted for vertical sliding movement relativeto the posts and connected in driving relation with the nailing units,and means to reciprocate the driving bar.

HARRY D. BENSON.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number

